use crate::{split::split, Block, Frame, View, P2};

pub fn decode(last_frame: &Frame, frame: &mut Frame, view: View, block: &Block) {
    match block {
        Block::Lit(pxs) => frame.import(view, &pxs),
        Block::Split([a, b]) => {
            let [av, bv] = split(view);
            decode(last_frame, frame, av, &a);
            decode(last_frame, frame, bv, &b);
        }
        Block::Ref(r) => {
            for y in view.a.y..view.b.y {
                for x in view.a.x..view.b.x {
                    let p = P2 { x, y };
                    frame[p] = last_frame[p + r.pos_off] + r.color_off
                }
            }
        }
    }
}